on the first day of the research, the participants will undergo anthropometric examinations (measuring height, weight, BMI, fat content, maximum oxygen consumption). In addition, the participants will undergo a heat tolerance test protocol. The heat tolerance test will be conducted twice in every participant - once in the follicular phase of the menstrual cycle, and a second time in the luteal phase of the cycle. During the protocol, the following information will be collected from each participant: heart rate, core temperature, skin temperature in three locations (chest, arm, and leg), oxygen consumption and liquid balance.